TMP88CS34FG datasheet(102/215 Pages) TOSHIBA

102 / 215 page

TMP88CS34/CP34

2007-09-12

88CS34-102

2.9.9

Clocked-synchronous 8-Bit SIO Mode Control

The following registers are used to control the serial bus interface (SBI) and monitor the

operation in the clocked-synchronous 8-bit SIO mode.

Serial Bus Interface Control Register A

SBICRA

(00020H)

SIOS

SIOINH

SIOM

“0”

SCK

(Initial value: 0000 *000)

SIOS

Indicate transfer start/stop

0: Stop

1: Start

SIOINH

Continue/abort transfer

0: Continue transfer

1: Abort transfer (automatically cleared after abort)

SIOM

Transfer mode select

00: 8-bit transmit mode

01: reserved

10: 8-bit transmit/receive mode

11: 8-bit receive mode

DV1CK

= 0

DV1CK

= 1

SCK

Serial clock selection

(At fc

= 16 MHz, Output on SCK

pin)

000: 1000.0 kHz

001:

500.0 kHz

010:

250.0 kHz

011:

125.0 kHz

100:

62.5 kHz

101:

31.2 kHz

110:

15.6 kHz

111: External clock (Input

from SCK pin)

000:

500.0 kHz

001:

250.0 kHz

010:

125.0 kHz

011:

62.5 kHz

100:

31.2 kHz

101:

15.6 kHz

110:

7.8 kHz

111: External clock (Input

from SCK pin)

Write

only

Note 1:

fc: High-frequency clock [Hz], *: Don’t care

Note 2:

Clear the SIOS to “0” and set the SIOINH to “1” when setting the transfer mode and serial clock.

Note 3:

SBICRA is write-only register and cannot be used with any of read-modify-write instructions such as bit

manipulation, etc.

Serial Bus Interface Data Register

SBIDBR

(00021H)

(Initial value: **** ****)

R/W

Note1 :

The data which was written into SBIDBR cannot be read, since a write buffer and a read buffer are

independent in SBIDBR. Therefore, SBIDBR cannot be used with any of read-modify-write instructions

such as bit manipulation, etc.

Note 2: *: Don’t care

Serial Bus Interface Control Register B

SBICRB

(00023H)

“0”

“1”

SBIM

SWRST1 SWRST0

(Initial value: **** 0000)

SBIM

Serial bus interface operation

mode selection

00: Port mode (serial bus interface output disable)

01: SIO mode

10: I

2C bus mode

11: reserved

SWRST1

SWRST0

Software reset start bit

Software reset starts by first writing “10” and next writing “01”

Write

only

Note 1:

*: Don’t care

Note 2:

Switch a mode to port after data transfer is complete.

Note 3:

Switch a mode to I

2C bus mode or clock synchronous 8-bit SIO mode after confirming that the port is

high-level.

Note 4:

SBICRB is a write-only register and cannot be used with any of read-modify-write instructions such as bit

manipulation, etc.

Note 5:

Clear bit 7 to 5 in SBICRB to “0”, and set bit 4 to “1”.

Note 6:

When the SWRST (bit 1, 0 in SBICRB) is written to “01”, “10”, software reset is occurred.

This time, control the serial bus interface and monitor the operation status registers except the SBIM (bit 3,

2 in SBICRB) and the CHS (bit 6 in PMPXCR) are reseted.

Control the serial bus interface and monitor the operation status registers are SBICRA, SBICRB, SBIDBR,

I2CAR, SBISRA, SBISRB, SCCRA, SCCRB and SCSR.

Figure 2.9.19 Control Register/Data Buffer Register/Status Register in SIO Mode (1)

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